clocksource/drivers/sun4i: Add definition of clear interrupt

To prevent misunderstanding, use TIMER_IRQ_CLEAR instead of TIMER_IRQ_EN
in function sun4i_timer_clear_interrupt.

Signed-off-by: Victor Hassan <victor@allwinnertech.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220906052056.43404-1-victor@allwinnertech.com


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>